EP0399643B1 - Druckfixierungs- und Entwicklungsgerät - Google Patents

Druckfixierungs- und Entwicklungsgerät Download PDF

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Publication number
EP0399643B1
EP0399643B1 EP90303813A EP90303813A EP0399643B1 EP 0399643 B1 EP0399643 B1 EP 0399643B1 EP 90303813 A EP90303813 A EP 90303813A EP 90303813 A EP90303813 A EP 90303813A EP 0399643 B1 EP0399643 B1 EP 0399643B1
Authority
EP
European Patent Office
Prior art keywords
core
shell
rollers
roller
pressure
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP90303813A
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English (en)
French (fr)
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EP0399643A2 (de
EP0399643A3 (de
Inventor
James D. Rise
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Xerox Corp
Original Assignee
Tektronix Inc
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Filing date
Publication date
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Publication of EP0399643A2 publication Critical patent/EP0399643A2/de
Publication of EP0399643A3 publication Critical patent/EP0399643A3/de
Application granted granted Critical
Publication of EP0399643B1 publication Critical patent/EP0399643B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03F—PHOTOMECHANICAL PRODUCTION OF TEXTURED OR PATTERNED SURFACES, e.g. FOR PRINTING, FOR PROCESSING OF SEMICONDUCTOR DEVICES; MATERIALS THEREFOR; ORIGINALS THEREFOR; APPARATUS SPECIALLY ADAPTED THEREFOR
    • G03F7/00—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor
    • G03F7/002—Photomechanical, e.g. photolithographic, production of textured or patterned surfaces, e.g. printing surfaces; Materials therefor, e.g. comprising photoresists; Apparatus specially adapted therefor using materials containing microcapsules; Preparing or processing such materials, e.g. by pressure; Devices or apparatus specially designed therefor
    • G03F7/0022—Devices or apparatus
    • G03F7/0027—Devices or apparatus characterised by pressure means
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B27/00—Photographic printing apparatus
    • G03B27/32—Projection printing apparatus, e.g. enlarger, copying camera
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G15/00—Apparatus for electrographic processes using a charge pattern
    • G03G15/20—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat
    • G03G15/2092—Apparatus for electrographic processes using a charge pattern for fixing, e.g. by using heat using pressure only
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B2227/00—Photographic printing apparatus
    • G03B2227/32—Projection printing apparatus, e.g. enlarging apparatus, copying camera
    • G03B2227/325—Microcapsule copiers
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G2215/00—Apparatus for electrophotographic processes
    • G03G2215/20—Details of the fixing device or porcess
    • G03G2215/2003—Structural features of the fixing device
    • G03G2215/2058—Shape of roller along rotational axis
    • G03G2215/2061—Shape of roller along rotational axis concave
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03G—ELECTROGRAPHY; ELECTROPHOTOGRAPHY; MAGNETOGRAPHY
    • G03G2215/00—Apparatus for electrophotographic processes
    • G03G2215/20—Details of the fixing device or porcess
    • G03G2215/2003—Structural features of the fixing device
    • G03G2215/2058—Shape of roller along rotational axis
    • G03G2215/2064—Shape of roller along rotational axis convex

Definitions

  • the present invention relates to a roll-type pressure fixing and developing apparatus in which ink containing sheet material to be treated is passed through a high pressure nip defined by a pair of rollers and is also directed to a roller for such an apparatus.
  • rollers are skewed, that is, their longitudinal axes are supported out of parallel with one another, to compensate for the deflection of the fixing rollers. Skewing the rollers allows the ends of the rollers to wrap around each other as they deflect under load, resulting in more uniform pressure along the nip.
  • Skewing the rollers also results in forces which act on the media in a direction substantially perpendicular to the path the media travels. These lateral forces tend to crease or curl the media during passage through the nip.
  • such an apparatus is generally limited to pressure fixing at one pressure value. For example, higher pressure causes greater deflection in the rollers, which requires a greater skewing angle to avoid non-uniformity along the nip.
  • U.S. Patent No. 4,363,862 of Giorgini discloses an apparatus for fixing toner powder images on sheet material.
  • a non-compliant pressure roller and compliant back up roller are supported with skewed longitudinal axes.
  • the pressure roller is a rigid non-compliant material, such as steel, with a non-compliant outer layer having an irregular surface comprising a plurality of randomly sized dome projections. Chrome is one example of this surface material.
  • the backup roller is described as having a sheath of a compliant material over a central core. Organic polymeric substances are mentioned as suitable for the sheath, with nylon 6/6, glass filled nylon, hard rubber and acetal resins being specifically mentioned.
  • the core of this backup roller is described as being of a rigid non-compliant material.
  • U.S. Patent No. 4,768,050 of Beery discloses a pair of pressure rollers used in conjunction with the "Mead" imaging process in which photosensitive micro capsules are ruptured by the rollers to provide the image.
  • This apparatus includes a first roller having a hollow shell with an axially central part defining a loading region.
  • a loading shaft extends through the shell and is joined to the shell only at the central loading region.
  • the interior surface of the shell is partially tapered, and is described as controlling the deflection of the shell portion of the roller when the roller is loaded at its ends.
  • the rollers define a working zone and are relieved at their ends to provide non-working regions.
  • this apparatus lacks versatility in being able to effectively treat sheet material of varying widths.
  • U.S. Patent No. 4,356,764 of Haugen discloses a pair of rollers which each include a central core of a uniform diameter and an outer hollow shell. Pressure transfer rollers support the shells on their respective cores with the transfer rollers engaging the supported shells at four spaced locations. Because the shell is supported at discrete locations by the transfer rollers, a less than uniform pressure would be expected along the nip. This is particularly expected to be the case when one of the outer cylindrical shells is made of an elastic material, such as rubber of about 35-60 durometer, as mentioned in one embodiment of this apparatus.
  • US Patent No. 4,372,247 of Calabrese relates to an apparatus for cold pressure fixing of toner powder on to a substrate.
  • Two parallel rollers are provided, each with a solid shaft surrounded by an elastomeric material supporting a rigid metal outer shell.
  • the shell and the start shaft are coaxial. Pressure is applied to one of the shafts at its ends.
  • This apparatus suffers from reduced pressure at the centre of the nip.
  • GB 1 545 312 is a similar prior art arrangement which suffers the same disadvantage.
  • EP-A- 0 130 452 discloses a roller fixing apparatus having a pressure roller and an internally heated fixing roller.
  • the fixing roller has a heated central shaft surrounded by a multi-part shell. Fitting around the shaft is an aluminium sleeve of varying external diameter.
  • an aluminium sleeve Surrounding the sleeve is a silicon elastomer following the contours of the aluminium sleeve and having a constant outer diameter.
  • a shrink fit foil material outer layer encases the silicon elastomer.
  • Prior art pressure fixing rolls known to the inventor suffer from problems when treating media of widely varying thickness types and/or widths.
  • the distribution of the load along the line of contact defining the nip can be controlled for a particular application.
  • the line load is controlled to be slightly higher at the center of the line. This construction minimizes the tendency for media to wrinkle so that widely varying types of media may be processed. Also, uniform fusing of the ink is still accomplished.
  • the core has an increasing cross sectional dimension moving from the respective ends of the core toward the center of the core.
  • the core in longitudinal cross section, has a crown in the shape of a beam deflection curve for a simply supported, uniformly loaded constant cross section beam.
  • the core increases in cross sectional dimension in discrete steps moving from the ends of the core toward the center of the core.
  • the core may be tapered from its center toward its first and second ends. Equivalently, the shell may be provided with a varying cross section, being thicker at the center than at the ends in the same manner as the core varies in thickness.
  • the line load is slightly higher at the center of the line.
  • one roll of the pressure fixing and developing apparatus has a rigid pressure applying surface while the other roll has a compliant pressure applying surface, particularly when media containing phase-change or hot-melt ink is being treated.
  • the elastomer preferably has a durometer of from about Shore A 30-60 and fills the space between the shell and core to provide continuous support for the shell and thereby for the pressure applying surface.
  • the elastomer may be compressed at the center of the roller relative to the ends of the roller to preload the center portion of the roller.
  • rollers defining the nip are oriented with longitudinal axes parallel to one another.
  • both rollers may be of a construction which includes a shell, a core, and elastomeric material disposed between the core and shell. It has also been found that improved results are achieved when only one of the rollers of this improved design is included in the apparatus.
  • media such as transparencies, envelopes, papers of various types including onion skin to 216 g/m2 (eighty pound) card stock and higher, plain and coated papers, drafting vellum, and so forth, without damaging the media.
  • Another preferred object of the present invention is to provide such an apparatus which can compress hot melt ink which has been solidified on media, whether the ink is present in a single layer, multiple layers, or a combination of such single and multiple layers, on a sheet of media.
  • Still another preferred object of the present invention is to provide an apparatus of this type which is capable of applying the desired pressure to the media independent of the media thickness, the width of the media, and the thickness of ink on the media.
  • a further object of the present invention is to provide an apparatus in which the line pressure or load applied to the media at the center of the nip is somewhat higher than the line pressure applied to the media at the ends of the nip.
  • the present invention comprises a roll-type fixing and developing apparatus in which sheet material to be treated is passed through a high pressure nip defined by a pair of rolls and to a roller for such an apparatus.
  • the apparatus has applicability to the fixing of toner powders on media, to "Mead” process applications in which photosensitive microcapsules are ruptured by passing one or more sheets containing such capsules between rollers, and to other applications in which pressure is used to fix, fuse or develop images on media.
  • the invention has particular applicability to the fixing of images formed by hot melt ink droplets solidified on media. In such cases, particularly in color applications, both single and multiple layers of ink are usually present simultaneously on the media.
  • the present invention accomplishes the desired fixing of solidified phase change ink droplets even under these circumstances.
  • the following description is directed toward the use of the apparatus in fixing solidified hot-melt ink droplets on media.
  • a printer has an ink jet print head 14 which includes an ink drop ejection orifice 16 from which ink drops, one being indicated at 18, are ejected in the direction of arrow 20 toward a sheet of ink drop receiving media 22.
  • the ink jet print head 14 may take any form and may be of the drop-on-demand type, wherein droplets are only ejected in response to the state of energization of an associated transducer.
  • Ink jet 14 may also be of the continuous type and may optionally be provided with an air assist for accelerating the delivery of ink drops toward the media.
  • One suitable ink jet print head is described in U. S. Patent No. 4,727,378 to Le et al.
  • ink drops 24, 26 and 28 are shown in FIG. 1 following their deposition on the target or media 22. These dots 24, 26 and 28, as well as other dots on the media, undergo a liquid to solid phase transition on the media. Also, the dots project somewhat from the surface of the media, the projection being exaggerated in FIG. 1. Certain types of media, such as transparencies, are not significantly penetrated by the ink droplets impinging thereon. As a result, for such media the droplets tend to project to a greater degree than from other types of more porous media, such as plain paper.
  • roller 40 includes an elongated outer tubular shell 50 which has an external pressure applying surface 52.
  • the surface 52 is typically smooth and of a right cylindrical shape.
  • the illustrated shell 50 is of a uniform thickness throughout its length.
  • An elongated core 54 is inserted into and extends along the length of the shell 50.
  • the core 54 and shell 50 are concentric with one another, that is, their respective longitudinal axes are coincident.
  • An elastomeric material 56 is disposed between the core and shell, the elastomeric material supporting the shell on the core.
  • the core 54 may be of a rigid, preferably non-compliant, material such as steel. By leaving the surface of the core somewhat rough, for example following machining or casting, better adhesion to the elastomer is achieved.
  • the elastomeric material 56 is compliant, and has a preferred durometer between Shore A 30 and 60, with a durometer of 35-45 being most preferred. As shown in FIG. 3, the elastomeric material fills the entire space between the core and shell so as to provide continuous support for the shell along the full length of the nip. The elastomeric material transfers both torque and pressure from the core to the shell and in effect performs as a low rate spring.
  • REN:C:O-Thane available from Ciba-Geigy Company.
  • the shell 52 is preferably of a compliant material and most preferably is of a polymeric material.
  • suitable materials for the shell 52 include acetal homo polymer and nylon 6/6 from the E. I. DuPont Corporation.
  • the roller 40 has the enhanced capacity to effectively treat paper containing differing thicknesses of ink.
  • the pressure between the rollers 40, 42 is maintained across the length of the nip even though the thickness of the ink varies.
  • the use of a compliant shell again as explained more fully below, allows the roller to deform at the edge of the media to thereby also enhance the uniformity of the line pressure across the edge of the media.
  • the shell 52 is capable of conforming to the thickness of the media and ink on the media, and yet is hard enough to define a high pressure nip and prevent the torque requirements of driving the rollers from becoming too extreme.
  • the roller 42 is also shown with a central core 60, an outer tubular shell 62 having an external pressure applying surface 64, and an elastomeric material 66 supporting the shell on the core.
  • the roller 42 may be similar in construction to the roller 40.
  • the roller 42 may be solid steel or be provided with a shell 62 of a rigid, non-compliant material such as steel.
  • shell 62 may be of a material having a Rockwell hardness from the high 50's to the mid 60's, with a Rockwell hardness of C-60 being one specific example.
  • the surface 64 of the shell 62 is finished in a conventional manner to be very smooth.
  • the shell 62 may be chrome plated in a conventional manner for corrosion resistance.
  • roller 42 provides a hard surface against which the ink coated surface of sheet 22 passes between the nip 32.
  • the roller 42 may be of a different diameter than the roller 40.
  • a relatively small diameter roller 42 may be used, without a backup roller.
  • shell 52 provides a compliant surface for receiving the media.
  • the respective rollers 40, 42 are shown rotating in the direction of arrows 70, 72 to pass the media 22 through the nip 32.
  • roll 42 is driven while roll 40 is driven by being in surface contact with roll 42.
  • the rolls 40, 42 may be geared or otherwise coupled together for driving purposes or separately driven if desired.
  • each of the illustrated cores 54, 60 are identical and therefore only core 54 will be described.
  • the core 54 may be hollow, but is typically solid with an increasing transverse cross-sectional dimension from the respective ends of the core to the center of the core. More specifically, the illustrated core 54 has been designed in longitudinal cross-section to have a crown in the shape of a beam deflection curve for a simply supported uniformly loaded constant cross-section beam. Consequently, when the respective ends of the core 54 are loaded with a load L in a direction normal to the longitudinal axis 80 of the core, this configuration of the core assists in producing the desired load profile along the full length of the pressure nip.
  • the roller 40 may have an outer diameter of 44.2mm (1.74 inches) and be approximately 310 mm (12.3 inches) long.
  • the core is typically 20.2 mm (0.8 inches) at the ends of the core and 35.4 mm (1.4 inches) in diameter at the center of the core with a 1.3 mm (0.05 inch) gap or space being provided between the core and shell at the center of the core. This gap, as well as-the remaining space between the shell and core, is filled with the elastomeric material 56.
  • a load L for example a load sufficient to produce 4.7 to 5.5 Kg/m (85-100 lbs.
  • a pressure fixing and developing apparatus of this construction is useable to treat media along the full width of the nip. Therefore, in this specific example, 313 mm (12.3 inch) wide media can be treated. At the same time, narrower media may also be treated with excellent results and without requiring the media to be centered between the nips.
  • the pressure at the center of the rollers is from 1% - 40% higher than the pressure at the ends of the rollers with a 10% to 20% differential being most preferred and a 15% differential being a specifically preferred pressure differential.
  • the higher the pressure differential the better the apparatus resists wrinkling of media and the less uniform the fusing. Conversely, the lower the pressure differential, the more uniform the fusing and the higher the chance of wrinkling some types of media. (The wrinkling problem is still minimal, however, with the present invention.)
  • the apparatus of the present invention is usable to process media of varying widths and thicknesses. For example, envelopes, paper ranging in weight from onion skin to 216 g/m2 (80 pound) stock, drafting vellum, transparency film and other media printed with hot melt ink have all been treated using the apparatus of the present invention.
  • the roller 42 may be replaced with a conventional roller, such as of solid steel or the like.
  • a conventional roller such as of solid steel or the like.
  • the benefits of the invention are still in large part achieved when a roller 40 of the FIG. 3 type is used in conjunction with the conventional roller 42.
  • the roller 42 serves to provide the desired line pressure.
  • a sheet of media 22 is shown with single and double layers of ink passing through the nip 32. Due to the compliance of the shell 42, virtually all of the media containing the single layer of ink (i.e., drop 24 being one example in this figure) and all of the area containing the multiple layers of ink (i.e., two such layers 26 and 28 being shown in this figure) are subjected to pressure by the pressure applying rolls 40, 42.
  • FIG. 6 one means of supporting, driving and applying pressure to the pressure rollers 40 and 42 is shown.
  • a steel roller 40 with a shaft 60, is shown above a roller 42, with the shell, core and elastomer.
  • the ends of the core 54 and the ends of the shaft 60 are journaled to a frame 88 to thereby rotatably support the respective rollers 40, 42.
  • the ends of core 54 are carried by a sliding block portion of frame 88 so that the roller 42 can shift upwardly against the roller 40.
  • the rollers are biased together at their respective ends by a spring or other biasing mechanism, one being shown at 89.
  • the roller 40 may be driven, as by a motor 90 and belt 92, coupled to a pulley 93 on shaft 60, in the direction of arrow 94.
  • a caming element 96 is pivotally mounted by a bushing 98 to the end of the core 54. This caming element has a caming surface 100 and an outwardly projecting stop engagement pin 103.
  • the caming element 96 is spaced from a caming element 101 keyed to shaft 60, the rollers 40, 42 are together, and pressure is applied across the nip by the outer surfaces of the rollers.
  • caming element 96 is rotated clockwise in Fig. 6 by the engaged rollers.
  • caming surface 100 engages the caming element 101, the elements 96, 101 shift the rollers 40, 42 apart and relieves the load from the pressure surfaces of the rollers.
  • the pressure is relieved at times when the apparatus is not being used to treat paper so that flat spots do not form on the outer surface of the shell of roller 42.
  • other drive mechanisms and pressure applying mechanisms are also suitable.
  • the core 54 has an increasing transverse cross-sectional dimension or diameter moving from the respective ends of the core toward the center of the core.
  • the core is tapered in a straight line fashion from the center of the core toward the respective ends of the core.
  • the pressure at the center of the roller will be somewhat higher than the pressure at the ends of the roller.
  • the pressure distribution across the nip will drop off to a somewhat greater extent toward the ends of the roller than in the FIG. 3 embodiment.
  • the core 54 is shown with an outer surface having discrete steps 110, 112, 114, 116, 118, 120 and 122, rather than a continuously curved surface as shown in FIG. 3.
  • the transverse cross-sectional dimension of the core increases moving from the outer ends of the core toward the center of the core.
  • some differential in nip pressure is expected at the surface of the shell in the region of the step.
  • the core in effect performs as if it has no steps.
  • the core 54 is of a uniform cross-section with the shell 50 again being supported by elastomer 56 on the core.
  • the combination of a shell 50 supported by elastomer 56 on the core 54 does assist in producing favorable results in comparison to solid rollers.
  • harder elastomer may be used at the center of the roller then at the ends of the roller to increase the line pressure at the center of the rollers.
  • the thickness of the shell 50 is varied with the shell being thicker at the center than the ends.
  • the interior surface of the shell has a similar shape as the outer surface of the core 54 in FIG. 3.
  • the interior surface of the shell 54 may, in cross section, be in the shape of a beam deflection curve for a simply supported beam.
  • the shell may have its interior surface configured like the outer surface of the cores of the other examples. The result is a line pressure which is slightly higher at the center of the core than at the ends of the core.
  • FIGS. 9 and 10 illustrate an embodiment of the invention in which the elastomer 56 is formed on the core 54 with the elastomer increasing in cross-sectional dimension moving from the ends of the core toward the center of the core.
  • the elastomer is shaped in longitudinal cross-section to have a crown similar to the crown of the core of FIG. 3.
  • the core and elastomer assembly is inserted (in direction of arrow 130) into the shell 50, the centermost portion of the elastomer is compressed. This makes the line pressure slightly greater at the center than at the ends and reduces the tendency of various papers to wrinkle.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Fixing For Electrophotography (AREA)
  • Rolls And Other Rotary Bodies (AREA)
  • Photographic Developing Apparatuses (AREA)
  • Registering, Tensioning, Guiding Webs, And Rollers Therefor (AREA)

Claims (12)

  1. Walzenartiges Druckfixierungs- und Entwicklungsgerät, bei dem zu behandelndes lagenartiges Material (22) durch einen Hochdruck-Walzenspalt geführt wird, welcher von einer ersten (40) und einer zweite Walze (42) gebildet wird, wobei das Gerät folgendes umfaßt:
       eine erste Walze (40) mit einer ersten Längsachse (80), ersten und zweiten Enden, und einer ersten druckaufbringenden Außenfläche (52);
       eine zweite Walze (42) mit einer zweiten Längsachse (84), ersten und zweiten Enden, und einer zweiten druckaufbringenden Außenfläche (64);
       eine Haltevorrichtung (88) zum Halten der ersten und der zweiten Walze in einer Stellung, bei der die erste Längsachse (80) parallel zu der zweiten Längsachse (84) ist und die erste druckaufbringende Fläche (52) gegen die zweite druckaufbringende Fläche (64) drückt, um einen ein Medium aufnehmenden Walzenspalt (32) zwischen den sich berührenden Abschnitten der ersten und der zweiten druckaufbringenden Oberflächen zu bilden, wobei die Haltevorrichtung (88) eine Lastvorrichtung (89) zum Aufbringen einer Last auf die Enden mindestens eines der ersten (54) und zweiten Kerne (60) umfaßt, um die erste druckaufbringende Fläche (52) gegen die zweite druckaufbringende Fläche (64) zu drängen; und
       wobei mindestens eine der ersten (40) und zweiten Walze (42) folgendes aufweist:
    (a) eine erste längliche rohrförmige Hülse (50) mit einer ersten druckaufbringenden Außenfläche (52) und einer ersten Längsachse (80), wobei die erste Hülse aus einem steifen Material besteht;
    (b) einen ersten länglichen Kern (54), der innerhalb der ersten rohrförmigen Hülse (50) angeordnet ist und dessen Längsachse mit der ersten Längsachse (80) ausgerichtet ist, wobei der erste Kern einen Mittelabschnitt hat und ein erstes und ein zweites Ende; und
    (c) einem Elastomermaterial (56), welches sich zwischen dem ersten Kern (54) und der ersten Hülse (50) befindet, wobei das Elastomermaterial die erste Hülse auf dem ersten Kern hält; und
       die mindestens eine der Walzen von der Lastvorrichtung belastet wird;
       dadurch gekennzeichnet, daß:
       die mindestens eine der Walzen eine Vorrichtung zum Erhöhen des Druckes im Zentrum des Walzenspaltes im Verhältnis zu dem Druck an den Enden des Walzenspaltes umfaßt.
  2. Vorrichtung nach Anspruch 1, wobei die mindestens eine der ersten (40) und zweiten Walzen (42) einen Kern (54) hat, dessen Querschnittsmaß sich von den Enden des Kerns zum Kernmittelpunkt hin erhöht.
  3. Vorrichtung nach Anspruch 1, wobei die mindestens eine der ersten und zweiten Walzen eine Hülse (62) aufweist, deren Dicke von den Enden der Hülse zum Hülsenmittelpunkt hin zunimmt.
  4. Vorrichtung nach Anspruch 2, wobei der Kern (54) in seinem Querschnitt in einzelnen Stufen von den Enden des Kern zum Kernmittelpunkt hin zunimmt.
  5. Vorrichtung nach Anspruch 2, wobei sich der Kern (54) von seinem Mittelpunkt zu seinem ersten und seinem zweiten Ende hin verjüngt.
  6. Vorrichtung nach Anspruch 2, wodurch sich für den Kern (54) im Querschnitt ein äußerer Verlauf in Form einer Biegung eines einfach gestützten, gleichmäßig belasteten Trägers mit konstantem Querschnitt ergibt.
  7. Vorrichtung nach Anspruch 3, wodurch sich für die Hülse (62) im Querschnitt ein innerer Verlauf in Form einer Biegung eines einfach gestützten, gleichmäßig belasteten Trägers mit konstantem Querschnitt ergibt.
  8. Vorrichtung nach Anspruch 1, wobei das Elastomer (66) eine mittels Durometer bestimmte Härte im Bereich von Shore A 30 bis 60 hat.
  9. Vorrichtung nach Anspruch 1, wobei das Elastomer (66) den Raum zwischen der Hülse (62) und dem Kern (60) ausfüllt, um eine kontinuierliche Lagerung der druckaufbringenden Fläche (64) zu gewährleisten.
  10. Vorrichtung nach Anspruch 1, wobei das Elastomer (66) am Mittelpunkt der Walze bezüglich der Enden der Walzen komprimiert wird, um das Elastomer am Mittelpunktsabschnitt der Walze vorzubelasten.
  11. Vorrichtung nach Anspruch 1, wobei das Elastomer (66) am Kernmittelpunkt härter ist als das Elastomer an den Enden des Kerns.
  12. Vorrichtung nach Anspruch 1, wobei das Elastomer (66) in Ringen ausgebildet ist, die an dem Kern befestigt sind.
EP90303813A 1989-05-24 1990-04-09 Druckfixierungs- und Entwicklungsgerät Expired - Lifetime EP0399643B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US357382 1989-05-24
US07/357,382 US5092235A (en) 1989-05-24 1989-05-24 Pressure fixing and developing apparatus

Publications (3)

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EP0399643A2 EP0399643A2 (de) 1990-11-28
EP0399643A3 EP0399643A3 (de) 1992-03-25
EP0399643B1 true EP0399643B1 (de) 1995-06-14

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US (1) US5092235A (de)
EP (1) EP0399643B1 (de)
JP (1) JPH037393A (de)
DE (1) DE69020047T2 (de)

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Also Published As

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DE69020047T2 (de) 1996-03-21
EP0399643A2 (de) 1990-11-28
DE69020047D1 (de) 1995-07-20
EP0399643A3 (de) 1992-03-25
US5092235A (en) 1992-03-03
JPH037393A (ja) 1991-01-14

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